The 10% myth study discussed in this chapter measured the beliefs of both psychology majors and non–psychology majors. The 39 non–psychology majors in this study provided the following values for the brain power variable:

a. Calculate the variance (s²) and standard deviation (s) of the estimates using either the definitional or the computational formulas. (Note: From Chapter 3, you may have already calculated the number of scores (N), sum of scores squared

((ΣX)²), the sum of squared scores (ΣX²), and the mean (X̅).)

Transcribed Image Text:

Non- Psychology Major Estimated Non- Psychology Brain Power Major Estimated Brain Power Non- Psychology Major Estimated Brain Power 1 15 14 10 10 27 15 2 45 15 20 28 25 3 10 16 50 29 10 4 40 17 25 30 20 5 5 18 45 31 10 6 10 19 40 32 5 7 50 20 25 33 15 8 45 9 10 22 21 10 34 10 22 5 35 5 10 10 23 15 36 60 11 35 24 5 37 10 12 5 25 40 40 38 5 13 15 26 30 39 15